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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '838550460b914ab9c8ef2c3625e66e7fc037ca7c10b7fed5b8e4c593745638f6' 
  AND token = 'ih82T5Ars1s8kIyIHD3hB91daOq16zQyYzAPevcDP3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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