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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '294d80f32a95a95796880d09da8e74aeb7a97de19377fdc572ea38167b2d857d' 
  AND token = 'e24JepcxCJfJd+T19cN+21tdwOrIg4CRoFwBJh4RZ5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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