SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a436ccdb73fb51446d885381d4c90b1afa65c9353201346b16934e6db22a6e6' 
  AND token = 'hsDg0qVrQdWnuN2byMgBgMve6+3u5fQAhjwtpmkoXgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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