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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f38d8570f49d53de95495ff65005451a3a855fb64c683a154ea57389c58caa6' 
  AND token = '2Rc6hOS9ujfVY96Z3hUY8eIeDxyKWy6uA/Nt029Nnrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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