SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dfe14f33c2b5c9f0892450434044c9c3d6e38e78c8176090518778600536158' 
  AND token = 'eAV5U/zjr2w0yJLrODQfRPOh/M92FFO6SmxzfJqKQBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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