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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bbfaf264d3906e5f09bfce2eef62520fb35b14d30fd969747e2ec56a45062ca' 
  AND token = 'pn/33o69X1XrCput7gMw3WqSQJNARL/dDnsTdN0WOT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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