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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e090a46a16604f9dff78d1a0a876b29ed756f0b9a3fbbe479e264eb5f20a1be2' 
  AND token = '6P49E5Qiuok6iUGg9GbZ8dw/C/8FtOLGt6fXZcjk6+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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