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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24a980e26a63c3a57483f1ef8e8384cc346f3e24b04ba3c59c2c9afbf29a7862' 
  AND token = 'wZil+epX6AlPobQQmdq/ZijHUAPvnvvmrg7fXyMl1wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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