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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '387f8aae0227d8c1b5a167cf8cd14e27411d90b83f1d8423f6ea234681fa4651' 
  AND token = '/S3RfAUXiJ7Ki8Q9bIkxqHw+AlsiKqsQ32m0raGUBMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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