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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e18d157deaaa2f46288c54700fa7664519b2bd5fde1b03f7dd8c715734166e1f' 
  AND token = 'arK30XQHdi7Dk+F9cShKLgyRMXi54VC0PPozqaUEp4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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