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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e56216c183cebecc83143140b577fa110e26af61f46da30634ac4b20ea72855' 
  AND token = 'p75DyAs2gkvDoxGrV1XJLj0sktP5aVonKOng2Ufzwi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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