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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '449649eeb9f13d6f0ab507a7251a811dda2a5a53acf8339dfde6f0bcf58cb031' 
  AND token = 'A770HN7Uceycul1PSP2Wyp3KdaTV8FDoTANDmw0+/F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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