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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b36e088a326e8d0b87838421608ec339867edd9ce16dcc95884a044f5b5c982' 
  AND token = '4deiW53SeY6WfULf540jwJ0QH9mCBicYE1Zehpuh50w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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