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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1f5df4de5e31a641e81f2fc8739ccc187634f73c43a9e8319c82ef1eec1ef0e' 
  AND token = 'YC65iHgtje4RU5crARPO7BBshRSGolxERTp7snyWgTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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