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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85ef8d970f80b00a1a88a9a00ef042b5ac8435db78d06056abede25211421d6a' 
  AND token = 'nY5OBbNAZ5Df9jN0a7I7O+ANic2whCqA4kq2OF2Lw7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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