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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'baef113af44a6e8671ac0ebd9759053778c7ee908fcfa04d11a9fb68971ce89c' 
  AND token = 'IuQ4rnFydJjdLl87yhWuqbLbE88g7cMIN26wuc4rK0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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