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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3f93fac59dd86020f2b7387a266580750bb44aebbd86cffb6111d6f36fe3fed' 
  AND token = 'gtokYUqL/tXFijL8HxBRAaPRrcDOYsHQaXseEntMPUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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