SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '789da5133274971ff90318511bd0633f21d0ed446841b6ad0d238fcf44edcdab' 
  AND token = 'E7jl6ZssGpzLg2KX0oBNZzwzqsaFBHGzfH0XExgEhEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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