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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f496a5954aa27fcf557f49353c4985139a540c5094c2cedba65acf4f46754b9' 
  AND token = 'yhE6NdcfP7sr8XtFlW9r8Magfvk1QJFjhm37WN3lgsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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