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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67f71bece873c2dc3136ae28faf35c2f9e4e4366e58e9b5a7fb17d95e505cc56' 
  AND token = 'H7y2/gs8YT20OCBoqe326VS9YzCY14cYI8oiUN6xtr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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