SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95aac69afb61a2ea443d4c1895ed030aa6a66645782e39121199c27e08b57331' 
  AND token = 'F6CWzwhLdm93z87ruRdE8IXgYP+KTtza/fMUBK7aq44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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