SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca9a526366b75c7bfb572ed77b0cc9c6c56c358194a1a7ed0034eda0683da9ea' 
  AND token = 'uIH906+E0PXOSFBgMvVlVJg/5LYj/Aohsrqzx+ss1Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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