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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97948c2e595b27b7c94fe93cc5f35b89771424406af871bf8cc85b3478606a96' 
  AND token = 'PqIkKpTOoiA6hvYjn5Hyk7YiGa7USFy9xxcX//L9S1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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