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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ab98e0a26a5065e53ffdfc5a9f0657b00b6623e5b360be359a1a33f6f9d5387' 
  AND token = 'CfPHBnoLgL7KBShcyhqXe94sMEQcRmGteL0x572nrJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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