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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaa7e5297ad577eb1308f785cf5eb1ccecf6cc6991905fd6b19bb95478dabe82' 
  AND token = 'scm/Cz6Lv6GxllPiqwaf7PzyfpFjk4S+7ayukD0yFHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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