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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '261880ba3625b5dc6666b65326f9d4ca5b7c7099a8f79a725ad7ec78c15b2124' 
  AND token = 'NZhLD5AXxUpnojiu5y9ij/kNaIvR0HbCdsXAxQMwnzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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