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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da46d85d67302c7719ad1cc10f5d31c84ac4ac64162044ec6b9d17a9223d3233' 
  AND token = '2PndnFZUQkvheufejeDIlx8IO8SDr5ip9dvV5PKb4Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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