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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24f62d1b3dd4d499706124f7523b552a7eadc7a6accdb1181f765970161c92b5' 
  AND token = 'XI42J9WtgYiRuO0Lw6ACsVybCYtQPr0/UWDYcZNsaPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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