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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '234a589e1ad32cc65dc74ef1e55e61fd62185522e35de9be1d6ccc87009ac092' 
  AND token = 'A753+kmirfkIzfosmWeBAzPtm9waE/pVY6aZGGwf0OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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