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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35902aacf8ce2b63cf70e2f8f4373d35531cd932f5bd64135826a32a48326920' 
  AND token = 'CS75SNBp/SoyK+nid/nDpATwuEslIAQrKPNjlHc3OcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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