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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7180ffdd6918a61f759ad4dba9c94d5d16a332b60728f49d9b8fcd35b8208ef3' 
  AND token = 'fuCpa6sx+6BFDmUUnLfLdC9QR7hCx+4aYyoImsRib7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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