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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae5ae754c9b85e1e124420511e061621c6fe0d0ac0afb49049ffb64023950d7a' 
  AND token = 'rwB10gmhFUT1WT8a/PimpxXmGkijlT5x1ZCWKYR3fLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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