SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aeed0eee818fdae8592792c930fb845abc9b47840fdd4526219fe509449c626a' 
  AND token = '3BW5KbvjQUKB+e3Z/9Gq4XB+YHLFM4Z+owYsGIEugr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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