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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dc6683dcb2dc3ef8dc7762f60e6daea2c20cdb3bf273298cc76c2c2b5da8420' 
  AND token = '2JeU4IDiCPuQkcZ4euk/W9Bb0l1c5JZeqIESljoxX5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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