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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7213d20e9ca283bf3b8738737997999b43fd483539fd4844e0cbe2bc366a7f8e' 
  AND token = 'jvbActntz5m23ykLUrw7hN2vcNjzJfJiS+Hx/XjT6s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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