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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00bbbebf4d08678ebd36017bd73c319997ba31771e00c818421b2ca82b52c405' 
  AND token = 'wqk1m4EfLbc2ozrtDJc8Mliwl34n5PT78js6c2PZVug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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