SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a72cb951f947f979b1ae1d662c20943a6b756e187ce752edf8d520dd4b0e61a1' 
  AND token = 'uKBp4SEv370Io8QUWPaOGYwljvQwq+CafSr5x4VLI9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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