SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '351ecdd9829adca0e775b7f3182e5c70c7730bcb2d825c2567f77445d81905b8' 
  AND token = 'JWzMOkujJ79VYXlZPVx4h52a56BPIwByi4z3sQGBlG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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