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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4c2e41eec07e22626628ac02f53936e296599d6e62a6484ac970d5c4a54669a' 
  AND token = '/8NKm9vK2bAgszPczs+Uo8WUv9TXdkP2JEHXz8A+I4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}