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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52f11ee9bc5c99c944a7fdeb824aef5080fd112c48755d601bb2fbc8877766f8' 
  AND token = 'kprOkoe1xyKxx3Xcj9klI6zEQAj2FtxB/ehp8qcsooE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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