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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca6633b1a90c2b1d091a6497c2bbbdc6df2fd9690dd77ae5f0e289be832df50d' 
  AND token = 'P7iCw2cvLqo5CSSdB4FYsQo2qwNgWcoN6aixCwKKJoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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