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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a9c4ba5b6dc2fe5c6a84778fd77c8a9c23d0c36f997e799244918c8e746723f' 
  AND token = 'kUC8T7mpqZKyt8Ahz24SKVYAirAkU8hwMW3f1PzIf6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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