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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f60a13e6156170cdfec5435286e0f73565cc843c6afcd1b73a1a376f9dec7a55' 
  AND token = 'eBpRp23tkCbgdbjmVEn8ewlYc4FSQ3/bq3G304Kl42M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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