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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c732f1235cf2acac357832722950a3661e72c2296d6725a9a6bb79aa3aa1ca1b' 
  AND token = 'eCtRX2F2lnRSoo5IGYUwmWlhEoNOAxEIazGxElXcTjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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