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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '088a9e6ba0fc493cd7e6df4daafa1b4af306ff2315dcfff140f5779c5bf3b49d' 
  AND token = 'jzbrhkSyf/a8e8YAD8S170FKUpIAY5J/JuWxmSK61VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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