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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05ab78c58145f9aedbe4d132ddfb75f7fbc134b68ba8adcedb3f64b9d24cec61' 
  AND token = '2cBRR/nmK5y7/80KoSwYEmteZonwn6or9xG2qsIoRh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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