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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3f97a186ee06ff732767a08d546a615d1b1914cf551fe6d5e3955c5817f01f3' 
  AND token = 'stSaRGkBH6t+RtSblQPzLaPNNiG1mJyFPGTBYliXDuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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