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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5daa9424880d3133ba018be309829e67178d583421e8775f13f7e45161d200e' 
  AND token = '78raMRHX5TMCWAZcvUofZvvZi6YQ4hWqStyvyo6Drqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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