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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17d723ca69dfdc9a46fae6ee2ac0421f6f2ba365057581b1b6d0eccbd1b5e2d6' 
  AND token = 't8Xd8p8Zrhb7l1Q0PkBIkjQ4BAP3xDjbtJvhk2qnpBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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