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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59885a4e10190748c1aebe4a65299775def69ddf97e40325e8f23f2c2a7827c7' 
  AND token = 'alLs7QPzoQaJKo6ieKJYV/0EfNSh3evfZUd3Mb1uauc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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