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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3e2147f99a972d63bd906b38942d9abd6428ee696b57d7835a0f3c1b595048f' 
  AND token = '7nhx9ugjL8s3klk/n9fG5bkPnsak0RNtxu8r3qVNeMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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