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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afdacc410fc9dd919e34f4202411aedb8cc7c56f7e5b6ca2bd86d31ae3707704' 
  AND token = '2sxZTlvUNDEGqt7fq4J66QwkMqFqfQeY/f799tOCW3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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