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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e75320967a9c1b304b07d7d57fd783c9dc09ac0f19aa9c0a58ac78860fdb37bc' 
  AND token = 'PwYI4lAw0zkwinF9EcT5EuGkFN4J2henMEmmImTiqfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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