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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fc17c5d64c923564cbbd7d5ec1cfdd7a712b2e49bbce58a5b6da78a146a6597' 
  AND token = '5QXIzeGalL2Xxw5cNjjYIG7qR2AOL1Ic8iQfOFxndOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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