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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae129a51285ded692c997dd29cd90664352bcd88cdec15dfcfa5661fb495e445' 
  AND token = 'PIWu47t7O/NeMgeZFIgewvkr4W89a6icT1N/WAWBajY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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