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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '852d9669008bfdb09d9c8c441c569a67a12179abb6940096e137778c2105d745' 
  AND token = 'gFgxq2dFMylTnitGDv2uITAj7aH4hTb7mD2/17gKhi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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