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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e51c8d47adbfb233f43b231eed3e8149f4c9ee9afb4b664498ee290980531fd' 
  AND token = 'WfPB3cJO96grVjP9Rh2JK2HfwRP4QONi9WYKWPbZhXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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