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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7df6dadf2fcd4a9413bda37ef14d12bdf6e1eae4d8b575bc4805d41236e9cc57' 
  AND token = 'E41JNQlwSwvDl6aLTgcj3+5GHgo3jTxZQZhtonXTxso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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