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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '528c5560eb6c9652ad660c45a32782aaa8cbeab534c74fc0fdf9d5ca0463d28e' 
  AND token = 'IVZ6Wt7hYjOz395BfN7i9hloPYEMgy97mba808qemeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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