SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c44e3c154c6f46fbc90789267a9b5cc08eab948688de7634572731d192e3b143' 
  AND token = 'bjjpf21pjWvdc3dGe225YX6E/avHFzNwYiXZhH67swg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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