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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1799e8525e3d34d5c0e01f49c9b69935ad43bd2200f1be940a323f32f90d48d' 
  AND token = 'K9xa1duHzSQwB15KFW5/jUOH89FwFv/nDMbxlKEg6BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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