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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad6a3d64b1f459b5c8b86cee54e252bac1104d6dd4147cfb33be69fbc4873703' 
  AND token = '8lRSvgn7q29mw/1p+i11Nn1RdhJkLtOjxEEcOBxtT1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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