SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c2f215b8494fffc588b6e4099a5446ded8f3d8852b0fa914995d95cefa278b0' 
  AND token = 'Rg09vJBUWOidZyVKAAAelcNsQwY0V297hRyXJWyCmoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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